Browsing by Author "Costa, Lino"
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- Adaptations of a resources system selection problem of Distributed/Agile/Virtual Enterprises for using genetic algorithmsPublication . Ávila, Paulo; Mota, Alzira; Putnik, Goran; Costa, LinoThe selection of resource systems is still a difficult matter to solve in distributed / Agile / Virtual enterprises ( D/A/V Es ) integration. Attempts to solve the resources selection problem, has originated several models and consequently different algorithms have been applied to obtain solutions. The exact algorithms have good performance (in terms of computational time) for low dimension problems. However, become ineffective as the complexity increases. Genetic algorithms are considered robust and versatile. These have been applied to complex problems in several application areas and gained popularity in innumerable research works. To improve the computational time in solving the resources selection problem, we pretend to apply a genetic algorithm. Due to the characteristics of the model, the application of this algorithm forced adjustments in the initial model. In this work, we present the adaptations performed in the study model in order to use genetic algorithms.
- Collaborative Planning in Non-Hierarchical Networks—An Intelligent Negotiation-Based FrameworkPublication . Bastos, João; Azevedo, Américo; Ávila, Paulo; Mota, Alzira; Costa, Lino; Castro, HelioIn today’s competing business market, companies are constantly challenged to dynamically adapt to customer expectations by diminishing the time response that goes from the beginning of the business opportunity to the satisfaction of the customer need. Simultaneously, there is increased recognition of the advantages that companies obtain in focusing on their core business and seeking other competencies through partnerships with other partners by forming collaborative networks. These new collaborative organizational structures require a new set of methods and tools to support the management of manufacturing processes across the entire supply chain. The present paper addresses the collaborative production planning problem in networks of non-hierarchical, decentralized, and independent companies. By proposing a collaborative planning intelligent framework composed of a web-based set of methods, tools, and technologies, the present study intends to provide network stakeholders with the necessary means to responsively and efficiently address each one of the market business opportunities. Through this new holistic framework, the managers of the networked companies can address the challenges posed during collaborative network formation and supply chain production planning.
- Resources selection for agile/virtual enterprises part il - prototype/demonstrator toolPublication . Castro, Álvaro; Pires, António; Costa, Lino; Putnik, Goran; Ávila, PauloThe process of creation/development of an AN E is not simple. Due to the large number of potential resources is important to make a selection of those who give more guarantees in terms of success in this cooperation and bring more value to A/V E. There are several projects of AN E with different approaches to the selection process. The Virtual Enterprise Architecture Reference Model (BM VEARM) project incorporates a model of resource selection. Considering the aspects of the model the main objective is the development of a tool for pre-selection of resources in MATLAB, and its integration with an algorithm for the final selection. The result is the tool named Selec_E AN V2 with the following features: Pre-selection of resources without integration of the Value Analysis (VA), with integration of VA and final selection of resources given to those mentioned cases. This tool will support the development of BM_VEARM selection model and will permit the validation of the importance of VA in the resources pre-selection.